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GrimmSpeed OEM Downpipe to 3in Cat Back Adapter

MODEL # GRM077046

$39.00

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  • Q: How to properly use  Blown Headgasket2 months ago

    So I need the adapter plus a donut gasket to have it ensure a proper seal? Or is a donut gasket not needed with this?
    • 0 of 0 people found the following answer helpful

      A:  If you have an OEM or OEM diameter downpipe this will fit perfectly. You don't need a new donut gasket, but it is highly recommended.

      Michael N. @ RallySport Direct 2 months ago  
        
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  • Q: Exhaust invidia r400   sanchezuriel1874 months ago

    Do I need this when installing invidia r400 exhaust to my Subaru sti 2016?

  • Q: Cobb and grimmspeed   Breezy_STI4 months ago

    I recently got a Cobb downpipe installed Is it possible to run that with a grimmspeed catback exhaust and if so what would I need to get that set up correctly . Is it just an adapter that’ll be needed ? Thanks for any info you can give to help me out .

  • Q: Cobb Downpipe to Invidia R400 Set up  13 STI5 months ago

    I would like to change my current set up to a Cobb downpipe catted bellmouth and to a invidia r400 catback on my 2013 sti sedan, would I need this adapter?

  • Q: Cobb Catback  04Sti6 months ago

    Hello, i was wondering if i need this for the Cobb catback while running stock DP on an '04 STi? Thanks
    • 0 of 0 people found the following answer helpful

      A:  This adapter would not be needed for the Stock downpipe to Cobb Catback connection. The Cobb Catback tapers down to 2.5 inches like stock. You would just need a donut gasket for the connection.

      Karsten B. @ RallySport Direct 6 months ago  
        
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  • Q: Donut Gasket  Sam French7 months ago

    Will I also need an OEM donut gasket to help seal the exhaust?

  • Q: Invidia N1 Cat Back  doucheung08710288 months ago

    does this fit with the Invidia N1 Dual tip cat back exhaust with the OEM downpipe? or do i actually need to get this? Thanks
    • 1 of 1 people found the following answer helpful

      A:  Yes, this would be the adapter you want to use when installing any aftermarket 3" catback exhaust on the Stock Downpipe.

      Brady R @ RallySport Direct 8 months ago  
        
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  • Q: Tomei ti catback/COBB downpipe  Nelson Asay1 year ago

    is this what I would need to make sure the Tomei ti catback for my COBB downpipe to bolt up correctly?

  • Q: Installing Invidia Downpipe to N1 Race Exhaust  Zystus1 year ago

    I am currently using this on my stock DP with the Invidia N1 Race Exhaust but now I am going to buy an Invidia Downpipe, would this still work? Or do I have to buy another gasket for the set up?
    • 0 of 0 people found the following answer helpful

      A:  This will work while you're running the OEM downpipe. Once you install the Invidia, you'll just want a regular 3" 2 bolt gasket.

      Marcus E. @ RallySport Direct 1 year ago  
        
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  • Q: Mazdaspeed  Mazdaspeed 1 year ago

    Is it compatible with mazdaspeed 3 with catback 3 "and test pipe 2'5"oem ??
    • 0 of 0 people found the following answer helpful

      A:  This is only confirmed to fit the Subaru models we cannot confirm them to fit the MazdaSpeed3.

      Jared A. @ RallySport Direct 1 year ago  
        
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  • Q: 2013 subaru wrx hatch w/ invidia r400   boxerengine111 year ago

    i bought the invidia r400 for my 2013 subaru wrx hatch. im not sure if im only supposed to use the gasket that comes with the exhaust or will i need to buy this also with the donut gasket or reuse the oem donut gasket?

  • Q: Correct adapter??  GeorgeV2 years ago

    I will be going with the COBB resonated j-pipe and the Invidia N1 catback. Is this the right adapter or what do I need? Can’t find a solid question. Thanks!
    • 1 of 1 people found the following answer helpful

      A:  Yes, this will be the adapter you will need.

      Tyler A. @ RallySport Direct 2 years ago  
        
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    • 1 of 1 people found the following answer helpful

      A:  Answered my own question when I bought the Cobb downpipe and Invidia cst back: no you do not need this. Kinda peeved I wasted the money when the Cobb comes with a regular flange and just an adapter for the stock donut style.

      GeorgeV
        
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  • Q: Namless Catback exhaust   Chris 2 years ago

    Hi i currently have a nameless catback exhaust setup and plan on getting an invidia downpipe, would i still need to get this adpater?
    • 0 of 0 people found the following answer helpful

      A:  You will need the opposited adapter that converts a 3 inch downpipe to OEM exhaust. Yes I am aware you said Nameless catback but you will still be utilizing stock sizing.

      Tyler A. @ RallySport Direct 2 years ago  
        
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  • Q: Will I need this adapter for 2017 WRX OEM downpipe and Invidia R400?  WRX2 years ago

    Will I need this adapter for 2017 WRX OEM downpipe and Invidia R400? R400 is 3 inch which matches the OEM downpipe size.
    • 0 of 0 people found the following answer helpful

      A:  The OEM downpipe on ALL Subaru models are 2.5 inches. You will need this adapter if you plan to run any Invidia Exhaust

      Tyler A. @ RallySport Direct 2 years ago  
        
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  • Q: Adapter gasket  D2 years ago

    Does this adapter come with a donut gasket or is that sold separately?

  • Q: Gasket   Andrew35 2 years ago

    Will this adapter work with my 06 sti. I have a p&l straight pipe, with a stock down pipe ?

  • Q: Tomei Catback to Invidia Catless Downpipe  joelangreo2 years ago

    Hi, I've currently been using this part to connect my tomei catback to my stock downpipe. Do I still need this part now that I am about to install my invidia catless downpipe? (car is 2016 wrx manual)

  • Q: Exhaust seal  Neez 063 years ago

    I want to connect oem dp to 3in CB. To get a perfect seal with this product , will I still need to use the stock donut gasket on the dp side and a 3in gasket on the CB side?
    • 0 of 0 people found the following answer helpful

      A:  Yes, you will want the OEM donut gasket on the down pipe, then the adapter, then the gasket to the catback. There is a picture under User Media on this product page that gives a good explanation of how the products should sit.

      Chris W. @ RallySport Direct 3 years ago  
        
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  • Q: Fitting  Gregboy3 years ago

    I plan on buying the N1 Duel this week. You recommended this part, but when I added it to my basket it told me that it would not fit my 2015 WRX. Are you sure this is the right part?
    • 0 of 0 people found the following answer helpful

      A:  Although your car is not on the confirmed applications list, I dont see there being any issues with using this adapter.

      Josh P. @ RallySport Direct 3 years ago  
        
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  • Q: adapter  noahmancini127653 years ago

    Are there any other options for this? the adapter is to wide and will not fit with the stock downpipe bolts unless the holes are elongated. I've tried to install with a 2.5 downpipe to a 3inch invidia n1 and it would not fit/align correctly.
    • 0 of 0 people found the following answer helpful

      A:  Generally we dont have any fitment issues with this product. Please call us so we can better assist.

      Trevor C. @ RallySport Direct 3 years ago  
        
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  • Q: Will I need this?  jpdoeun717554 years ago

    I have a Cobb downpipe and Perrin catback exhaust that I am going to put on my 2014 WRX hatchback. Will I need this adapter for this combination?

  • Q: Help  jacobo_divine360164 years ago

    So I have an invidia catback exhaust hooked up to stock dp, I have some exhaust leak but also have it rattling a lot. Would this along with the stock donut gasket help the rattling?
    • 0 of 0 people found the following answer helpful

      A:  this is designed to work along with the donut, and is a 100% must to insure no exhaust leaks.

      Trevor C. @ RallySport Direct 4 years ago  
        
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  • Q: COBB Catback  Matt_G4 years ago

    Bought a used Cobb Catback will i need this to connect to my stock downpipe?
    • 0 of 0 people found the following answer helpful

      A:  This adapter is not necessary or recommended for the Cobb catback because the Cobb exhaust already comes with a tapered flange.

      Zach G. @ RallySport Direct 4 years ago  
        
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  • Q: fitment  JC474 years ago

    Will I need this when I get the Tomei Expreme Ti Titanium Catback to fit to my stock down pipe?
    • 0 of 0 people found the following answer helpful

      A:  This adapter will help seal any of the 3 inch 2 bolt flanged catbacks like the Tomei when using the stock downpipe.

      guest569faaee2a8d2517038b4568 @
        
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  • Q: Will this work with a fujitsubu cat back?  $teveMac4 years ago

    Will this work with a fujitsubu catback exhaust??
    • 0 of 0 people found the following answer helpful

      A:  We do not carry the Fujitsubu and cannot confirm. If the flange is a 2 bolt 3 it will work, if it tapers down to accept the stock donut gasket it will not be required.

      Nick S. @ RallySport Direct 4 years ago  
        
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  • Q: Will this fit on a Perrin catback system  carlopelaez326754 years ago

    I just bought a used Perrin catback system which was missing the M8 hardware that connects from OEM downpipe to the Perrin midsection. Will this adapter work with the OEM donut, or will I have to eliminate the donut?
    • 0 of 0 people found the following answer helpful

      A:  This will work with any 3 inch catback to OEM downpipe. Yes, It will reuse the donut gasket.

        
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  • Q: Need this?  Dakotat44 years ago

    I'm buying the Invidia N1 dual exhaust for my 2011 subaru WRX that is all stock so I was wondering if all I need is a donut gasket and this part as well? Everything is stock. Is this all I need?
    • 0 of 0 people found the following answer helpful

      A:  Yes, That should be all you need to make sure you have a good seal from OEM downpipe and 3 inch Catback.

      guest569faaee2a8d2517038b4568 @
        
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  • Q: '99 Impreza GT and Gasket doubt  axierjhtjz4 years ago

    Hi, will this work on my '99 Impreza GT with stock Downpipe? Also, the gasket from the first photo is included?
    • 0 of 0 people found the following answer helpful

      A:  This gasket for 3 inch turbo model Subaru's so this would not fit your car.

      Tommy M. @ RallySport Direct 4 years ago  
        
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    • 0 of 0 people found the following answer helpful

      A:  The gasket would not fit but the adapter will? DOo you have any adapter for '99 Impreza GT to 3 Catback?

      axierjhtjz
        
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